4 research outputs found
Supplement 1: Light confinement in a low-refraction-index microcavity bonded on a silicon substrate
suplemental document Originally published in Optica on 20 September 2016 (optica-3-9-937
Single-Band 2‑nm-Line-Width Plasmon Resonance in a Strongly Coupled Au Nanorod
This paper reports a dramatic reduction
in plasmon resonance line width of a single Au nanorod by coupling
it to a whispering gallery cavity of a silica microfiber. With fiber
diameter below 6 μm, strong coupling between the nanorod and
the cavity occurs, leading to evident mode splitting and spectral
narrowing. Using a 1.46-μm-diameter microfiber, we obtained
single-band 2-nm-line-width plasmon resonance in an Au nanorod around
a 655-nm-wavelength, with a quality factor up to 330 and extinction
ratio of 30 dB. Compared to an uncoupled Au nanorod, the strongly
coupled nanorod offers a 30-fold enhancement in the peak intensity
of plasmonic resonant scattering
Visible-Frequency Dielectric Metasurfaces for Multiwavelength Achromatic and Highly Dispersive Holograms
Dielectric metasurfaces built up with
nanostructures of high refractive index represent a powerful platform
for highly efficient flat optical devices due to their easy-tuning
electromagnetic scattering properties and relatively high transmission
efficiencies. Here we show visible-frequency silicon metasurfaces
formed by three kinds of nanoblocks multiplexed in a subwavelength
unit to constitute a metamolecule, which are capable of wavefront
manipulation for red, green, and blue light simultaneously. Full phase
control is achieved for each wavelength by independently changing
the in-plane orientations of the corresponding nanoblocks to induce
the required geometric phases. Achromatic and highly dispersive meta-holograms
are fabricated to demonstrate the wavefront manipulation with high
resolution. This technique could be viable for various practical holographic
applications and flat achromatic devices